import json
import re

from django.contrib.auth import login, authenticate, logout
from django.db import DatabaseError
from django.shortcuts import render, redirect
from django.http import HttpResponse, JsonResponse, HttpResponseForbidden
from django import http

# Create your views here.
from django.urls import reverse
from django.views import View
from django_redis import get_redis_connection

from carts.utils import merge_cart_cookie_to_redis
from goods.models import SKU
from meiduo_mall.utils.response_code import RETCODE
from meiduo_mall.utils.views import LoginRequiredMixin, LoginRequiredJSONMixin
from users.models import User, Address

# 导入:
from celery_tasks.email.tasks import send_verify_email

import logging

logger = logging.getLogger('django')


# def login_required(func):
#     def call_func(request, *args, **kwargs):
#         # 增加权限
#         if request.user.is_authenticated():
#
#             # 原来执行的代码
#             return func(request, *args, **kwargs)
#         else:
#             return redirect(reverse('users:login'))
#
#     return call_func

# class LoginRequired(object):
#     '''验证是否登录的工具类'''
#     @classmethod
#     def as_view(cls, **initkwargs):
#
#         view = super().as_view()
#
#         return login_required(view)
class UserBrowseHistory(LoginRequiredJSONMixin, View):
    """用户浏览记录"""

    def post(self, request):
        """保存用户浏览记录"""
        # 接收参数
        json_dict = json.loads(request.body.decode())
        sku_id = json_dict.get('sku_id')

        # 校验参数:
        try:
            SKU.objects.get(id=sku_id)
        except SKU.DoesNotExist:
            return http.HttpResponseForbidden('sku不存在')

        # 保存用户浏览数据
        redis_conn = get_redis_connection('history')
        pl = redis_conn.pipeline()
        user_id = request.user.id

        # 先去重: 这里给 0 代表去除所有的 sku_id
        pl.lrem('history_%s' % user_id, 0, sku_id)
        # 再存储
        pl.lpush('history_%s' % user_id, sku_id)
        # 最后截取: 界面有限, 只保留 5 个
        pl.ltrim('history_%s' % user_id, 0, 4)
        # 执行管道
        pl.execute()

        # 响应结果
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'OK'})

    def get(self, request):
        """获取用户浏览记录"""
        # 获取Redis存储的sku_id列表信息
        redis_conn = get_redis_connection('history')
        sku_ids = redis_conn.lrange('history_%s' % request.user.id, 0, -1)

        # 根据sku_ids列表数据，查询出商品sku信息
        skus = []
        for sku_id in sku_ids:
            sku = SKU.objects.get(id=sku_id)
            skus.append({
                'id': sku.id,
                'name': sku.name,
                'default_image_url': sku.default_image_url,
                'price': sku.price
            })

        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'OK', 'skus': skus})


class ChangePasswordView(LoginRequiredMixin, View):
    '''修改密码'''

    def get(self, request):
        '''展示修改密码界面'''

        return render(request, 'user_center_pass.html')

    def post(self, request):
        '''修改密码界面'''

        # 接受参数
        old_password = request.POST.get('old_password')
        new_password = request.POST.get('new_password')
        new_password2 = request.POST.get('new_password2')

        # 检验参数
        if not all([old_password, new_password, new_password2]):
            return http.HttpResponseForbidden('缺少必传参数')

        try:
            result = request.user.check_password(old_password)
        except Exception as e:
            logger.error(e)
            return render(request, 'user_center_pass.html', {'origin_pwd_errmsg': '原始密码错误'})
        if not result:
            return render(request, 'user_center_pass.html', {'origin_pwd_errmsg': '原始密码错误'})


        if not re.match(r'^[0-9A-Za-z]{8,20}$', new_password):
            return http.HttpResponseForbidden('请输入8-20位密码')
        if new_password2 != new_password:
            return http.HttpResponseForbidden('两次密码输入不一致')
        try:
            request.user.set_password(new_password)
            request.user.save()
        except Exception as e:
            logger.error(e)
            return render(request, 'user_center_pass.html', {'change_pwd_errmsg': '修改密码失败'})
        logout(request)
        response = redirect(reverse('users:login'))
        response.delete_cookie('username')
        return response


class UpdateTitleAddressView(LoginRequiredJSONMixin, View):
    '''设置地址标题'''

    def put(self, request, address_id):
        '''设置地址标题'''

        # 接收参数：地址标题
        json_dict = json.loads(request.body.decode())

        title = json_dict.get('title')

        try:

            address = Address.objects.get(id=address_id)

            address.title = title

            address.save()

        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '设置标题失败'})

        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '设置标题成功'})


class DefaultAddressView(LoginRequiredJSONMixin, View):

    def put(self, request, address_id):
        '''设置默认地址'''

        try:
            address = Address.objects.get(id=address_id)

            # 设置默认地址
            request.user.default_address = address
            request.user.save()

        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '设置默认地址失败'})

        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '设置默认地址成功'})


class UpdateDestroyAddressView(LoginRequiredJSONMixin, View):
    """修改和删除地址"""

    def put(self, request, address_id):
        """修改地址"""
        # 接收参数
        json_dict = json.loads(request.body.decode())
        receiver = json_dict.get('receiver')
        province_id = json_dict.get('province_id')
        city_id = json_dict.get('city_id')
        district_id = json_dict.get('district_id')
        place = json_dict.get('place')
        mobile = json_dict.get('mobile')
        tel = json_dict.get('tel')
        email = json_dict.get('email')

        # 校验参数
        if not all([receiver, province_id, city_id, district_id, place, mobile]):
            return http.HttpResponseForbidden('缺少必传参数')
        if not re.match(r'^1[3-9]\d{9}$', mobile):
            return http.HttpResponseForbidden('参数mobile有误')
        if tel:
            if not re.match(r'^(0[0-9]{2,3}-)?([2-9][0-9]{6,7})+(-[0-9]{1,4})?$', tel):
                return http.HttpResponseForbidden('参数tel有误')
        if email:
            if not re.match(r'^[a-z0-9][\w\.\-]*@[a-z0-9\-]+(\.[a-z]{2,5}){1,2}$', email):
                return http.HttpResponseForbidden('参数email有误')

        # 判断地址是否存在,并更新地址信息
        try:
            Address.objects.filter(id=address_id).update(
                user=request.user,
                title=receiver,
                receiver=receiver,
                province_id=province_id,
                city_id=city_id,
                district_id=district_id,
                place=place,
                mobile=mobile,
                tel=tel,
                email=email
            )
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR,
                                      'errmsg': '更新地址失败'})

        # 构造响应数据
        address = Address.objects.get(id=address_id)
        address_dict = {
            "id": address.id,
            "title": address.title,
            "receiver": address.receiver,
            "province": address.province.name,
            "city": address.city.name,
            "district": address.district.name,
            "place": address.place,
            "mobile": address.mobile,
            "tel": address.tel,
            "email": address.email
        }

        # 响应更新地址结果
        return http.JsonResponse({'code': RETCODE.OK,
                                  'errmsg': '更新地址成功',
                                  'address': address_dict})

    def delete(self, request, address_id):
        '''删除地址'''

        try:
            # 查询数据库逻辑删除
            address = Address.objects.get(id=address_id)

            # 将地址逻辑删除设置为True
            address.is_deleted = True
            address.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '删除地址失败'})

        # 响应删除地址结果
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '删除地址成功'})


class CreateAddressView(LoginRequiredJSONMixin, View):
    '''新增收货地址'''

    def post(self, request):
        '''
        新增地址请求
        :param request:
        :return:
        '''

        count = Address.objects.filter(user=request.user, is_deleted=False).count()

        if count >= 20:
            return http.JsonResponse({'code': RETCODE.THROTTLINGERR,
                                      'errmsg': '地址数量超过上限'})

        json_dict = json.loads(request.body.decode())

        receiver = json_dict.get('receiver')
        province_id = json_dict.get('province_id')
        city_id = json_dict.get('city_id')
        district_id = json_dict.get('district_id')
        place = json_dict.get('place')
        mobile = json_dict.get('mobile')
        tel = json_dict.get('tel')
        email = json_dict.get('email')

        if not all([receiver, province_id, city_id, district_id, place, mobile]):
            return http.HttpResponseForbidden('缺少必传参数')

        if not re.match(r'^1[3-9]\d{9}$', mobile):
            return http.HttpResponseForbidden('参数mobile有误')
        if tel:
            if not re.match(r'^(0[0-9]{2,3}-)?([2-9][0-9]{6,7})+(-[0-9]{1,4})?$', tel):
                return http.HttpResponseForbidden('参数tel有误')
        if email:
            if not re.match(r'^[a-z0-9][\w\.\-]*@[a-z0-9\-]+(\.[a-z]{2,5}){1,2}$', email):
                return http.HttpResponseForbidden('参数email有误')

        # 保存地址信息
        try:
            address = Address.objects.create(
                user=request.user,
                title=receiver,
                receiver=receiver,
                province_id=province_id,
                city_id=city_id,
                district_id=district_id,
                place=place,
                mobile=mobile,
                tel=tel,
                email=email
            )

            # 设置默认地址
            if not request.user.default_address:
                request.user.default_address = address
                request.user.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '新增地址失败'})

        # 新增地址成功，将新增的地址响应给前端实现局部刷新
        address_dict = {
            "id": address.id,
            "title": address.title,
            "receiver": address.receiver,
            "province": address.province.name,
            "city": address.city.name,
            "district": address.district.name,
            "place": address.place,
            "mobile": address.mobile,
            "tel": address.tel,
            "email": address.email
        }

        # 响应保存结果
        return http.JsonResponse({'code': RETCODE.OK,
                                  'errmsg': '新增地址成功',
                                  'address': address_dict})


class AddressView(LoginRequiredMixin, View):
    '''用户收货地址'''

    def get(self, request):
        '''
        提供收货地址界面
        :param request:
        :return:
        '''

        # 获取所有的地址:
        addresses = Address.objects.filter(user=request.user, is_deleted=False)

        # 创建空的列表
        address_dict_list = []
        # 遍历
        for address in addresses:
            address_dict = {
                "id": address.id,
                "title": address.title,
                "receiver": address.receiver,
                "province": address.province.name,
                "city": address.city.name,
                "district": address.district.name,
                "place": address.place,
                "mobile": address.mobile,
                "tel": address.tel,
                "email": address.email
            }

            # 将默认地址移动到最前面
            default_address = request.user.default_address
            if default_address.id == address.id:
                # 查询集 addresses 没有 insert 方法
                address_dict_list.insert(0, address_dict)
            else:
                address_dict_list.append(address_dict)

        context = {
            'default_address_id': request.user.default_address_id,
            'addresses': address_dict_list,
        }
        return render(request, 'user_center_site.html', context)


class VerifyEmail(View):
    '''验证邮箱'''

    def get(self, request):
        '''
        验证邮箱
        :param request:
        :return:
        '''
        # 接受参数
        token = request.GET.get('token')

        # 检测参数
        if not token:
            return http.HttpResponseForbidden('缺少参数token')

        user = User.check_verify_email_token(token)

        if not user:
            return http.HttpResponseForbidden('无效的token')

        try:
            user.email_active = True
            user.save()
        except Exception as e:
            logger.error(e)
            return http.HttpResponseServerError('邮箱验证失败')

        return redirect(reverse('users:info'))


class EmailView(LoginRequiredJSONMixin, View):
    '''添加邮箱'''

    def put(self, request):
        '''
        验证邮箱
        :param request: 请求
        :return:
        '''

        # 接受参数
        json_dict = json.loads(request.body.decode())

        email = json_dict.get('email')

        # 校验参数
        if not email:
            return http.HttpResponseForbidden('缺少email参数')
        if not re.match(r'^[a-z0-9][\w\.\-]*@[a-z0-9\-]+(\.[a-z]{2,5}){1,2}$', email):
            return http.HttpResponseForbidden('参数email有误')

        # 保存邮箱
        try:
            request.user.email = email
            request.user.save()
        except Exception as e:
            logger.error(e)
            return http.JsonResponse({'code': RETCODE.DBERR, 'errmsg': '添加邮箱失败'})

        # 异步发送验证邮件
        # verify_url = '邮件验证链接'
        verify_url = request.user.generate_verify_email_url()
        send_verify_email.delay(email, verify_url)
        # 添加邮箱成功返回
        return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '添加邮箱成功'})


class UserInfoView(LoginRequiredMixin, View):
    '''展示用户中心'''

    def get(self, request):
        '''
        展示用户中心
        :param request: 请求
        :return:
        '''

        context = {
            'username': request.user.username,
            'mobile': request.user.mobile,
            'email': request.user.email,
            'email_active': request.user.email_active
        }

        return render(request, 'user_center_info.html', context=context)


class LogoutView(View):
    '''登录退出'''

    def get(self, request):
        '''
        登录退出
        :param request: 请求
        :return: 首页
        '''

        # 退出登录
        logout(request)
        # 重定向到首页
        response = redirect(reverse('contents:index'))

        # 登录退出清除cookie信息
        response.delete_cookie('username')

        return response


class LoginView(View):
    '''登录借口'''

    def get(self, request):
        '''
        请求登录界面
        :param request: 请求
        :return: 登录界面
        '''
        return render(request, 'login.html')

    def post(self, request):
        '''实现登录逻辑'''

        # 1. 获取前端传递参数
        username = request.POST.get('username')
        password = request.POST.get('password')
        remembered = request.POST.get('remembered')
        # 2. 校验参数
        # 校验参数是否齐全
        if not all([username, password]):
            return http.HttpResponseForbidden('缺少必传参数')

        # 校验用户名格式
        if not re.match(r'^[a-zA-Z0-9_-]{5,20}$', username):
            return http.HttpResponseForbidden('请输入5-20位用户名')
        # 校验密码格式
        if not re.match(r'^[0-9A-Za-z]{8,20}$', password):
            return http.HttpResponseForbidden('请输入8-20位密码')

        # 3. 获取登录用户,并查看是否存在
        user = authenticate(username=username, password=password)
        if user is None:
            return render(request, 'login.html', {'account_errmsg': '用户名或密码错误'})
        # 4. 实现状态保持
        login(request, user)

        if remembered != 'on':
            # 不记住用户名
            request.session.set_expiry(0)
        else:
            # 记住用户名,none表示默认两周过期
            request.session.set_expiry(None)
        # 5. 返回响应

        # 获得跳转过来的地址
        next = request.GET.get('next')
        # 判断是存在
        if next:
            # 返回到请求跳转过来的界面
            response = redirect(next)
        else:
            # 重定向返回结果
            response = redirect(reverse('contents:index'))
        # 设置cookie信息
        response.set_cookie('username', user.username, max_age=3600 * 24 * 15)

        # 合并购物车
        response = merge_cart_cookie_to_redis(request=request, user=user, response=response)
        return response


class RegisterView(View):
    """用户注册"""

    def get(self, request):
        """

        :param request: 请求对象
        :return: 注册界面
        """
        return render(request, 'register.html')

    def post(self, request):
        '''
        实现用户注册
        :param request: 请求
        :return: 注册结果
        '''
        # 1.获得参数
        username = request.POST.get('username')
        password = request.POST.get('password')
        password2 = request.POST.get('password2')
        mobile = request.POST.get('mobile')
        allow = request.POST.get('allow')
        sms_code_client = request.POST.get('sms_code')

        # 校验参数
        # 检查参数是否齐全
        if not all([username, password, password2, mobile, allow]):
            return HttpResponseForbidden('缺少必传参数')
        # 判断用户名是否是5-20个字符
        if not re.match(r'^[a-zA-Z0-9_-]{5,20}$', username):
            return HttpResponseForbidden('请输入5-20字符的用户名')
        # 判断密码是否是8-20个字符
        if not re.match(r'^[0-9A-Za-z]{8,20}$', password):
            return HttpResponseForbidden('请输入8-20位的密码')
        # 判断两次输入密码是否一致
        if password != password2:
            return HttpResponseForbidden('两次输入的密码不一致')
        # 判断手机号是否合法
        if not re.match(r'^1[3-9]\d{9}$', mobile):
            return HttpResponseForbidden('请输入正确的手机号')
        # 判断是否勾选用户协议
        if allow != 'on':
            return HttpResponseForbidden('请勾选用户协议')

        # 判断短信验证码
        redis_conn = get_redis_connection('verify_code')

        sms_code_server = redis_conn.get('sms_code_%s' % mobile)

        if sms_code_server is None:
            # 不存在说明超时,直接返回注册页面
            return render(request,
                          'register.html',
                          {'sms_code_errmsg': '无效的验证码'})

        if sms_code_client != sms_code_server.decode('utf-8'):
            return render(request,
                          'register.html',
                          {'sms_code_errmsg': '输入验证码有误'})

        # 保存用户数据
        try:
            user = User.objects.create_user(username=username, password=password, mobile=mobile)
        except DatabaseError:
            return render(request, 'register.html', {'register_errmsg': '注册失败'})

        # 实现状态保持
        login(request, user)
        # 响应注册结果

        # 重定向返回结果
        response = redirect(reverse('contents:index'))
        # 设置cookie信息
        response.set_cookie('username', user.username, max_age=3600 * 24 * 15)
        return response


class UsernameCountView(View):
    '''判断用户是否重复注册'''

    def get(self, request, username):
        '''

        :param request: 请求对象
        :param username: 传参用户名
        :return: Json
        '''
        # 请求数据库获得用户数量
        count = User.objects.filter(username=username).count()

        return JsonResponse({'code': RETCODE.OK, 'errmsg': 'ok', 'count': count})


class MobileCountView(View):
    '''手机号是否重复注册'''

    def get(self, request, mobile):
        '''

        :param request: 请求对象
        :param mobile: 手机号
        :return: Json
        '''
        # 请求数据库获得用户数量

        count = User.objects.filter(mobile=mobile).count()

        return JsonResponse({'code': RETCODE.OK, 'errmsg': 'ok', 'count': count})
